The Egyptian government's unprecedented shutdown of Internet and mobile phone access Friday stunned the world's technology community, which questioned whether the country can quickly recover from cutting such a vital link for commerce and communication.

The government's surprising move came in the face of widespread civil unrest, but essentially wiped the country off the world's online maps, said Jim Cowie, chief technology officer and co-founder of Renesys, a New Hampshire firm that monitors how the Internet is operating.

"It is astonishing because Egypt has so much potentially to lose in terms of credibility with the Internet community and the economic world," Cowie said. "It will set Egypt back for years in terms of its hopes of becoming a regional Internet power."

He said the long-term economic effects are unclear because "we've never seen a country rebooted on this scale before."

The shutdown illustrated how ingrained the Internet has become for everyday global communications.

Moreover, the unrest in Egypt, and that in Tunisia the week before, have once again highlighted how vital online social networks like San Francisco's Twitter Inc., and Palo Alto's Facebook Inc. and the video-sharing site YouTube Inc. of San Bruno have become in exporting ideals such as freedom of speech.

Protesters, for example, used a Facebook page to list their demands and rally support.

"A world without the Internet is unimaginable," Facebook spokesman Andrew Noyes said in an e-mailed response to the Egyptian shutdown.

"Although the turmoil in Egypt is a matter for the Egyptian people and their government to resolve, limiting Internet access for millions of people is a matter of concern for the global community. It is essential to communication and to commerce. No one should be denied access to the Internet."

Facebook and Twitter

Both Facebook and Twitter reported diminishing traffic to and from Egypt as the protests escalated this week, presumably as the government sought to filter those sites.

The precise "surgical" targeting of Facebook and Twitter wasn't surprising, though it failed to quell the uprising. But Cowie said he was astonished when the country began cutting all access, especially because Egypt has aspirations to become a Middle East hub for Internet operations.

'Obliged to comply'

Renesys watched as about 93 percent of Egypt's Internet traffic began to shut down after midnight Friday in Cairo. Cowie said he could track each of the country's major Internet service providers as they began a shutdown and data suggest government officials made a series of quick phone calls within a few minutes.

In a statement on the company's website, Vodafone Egypt also said that "all mobile operators in Egypt have been instructed to suspend services in selected areas. Under Egyptian legislation the authorities have the right to issue such an order and we are obliged to comply with it. The Egyptian authorities will be clarifying the situation in due course."

Cowie said there was only one other similar government-ordered online shutdown, in Burma in 2007, but that did not compare to the outage in as large a country as Egypt.

"What happens when you disconnect a modern economy and 80 million people from the Internet?" Cowie wrote in a Renesys blog. "What will happen tomorrow, on the streets and in the credit markets? This has never happened before and the unknowns are piling up."

The nonprofit Internet Society of Reston, Va., said that shutdown was "an inappropriate response to a political crisis" and "a serious intrusion into its citizens' basic rights to communicate."

'Ones that will suffer'

"Ultimately, the Egyptian people and nation are the ones that will suffer, while the rest of the world will be worse off with the loss of Egyptian voices on the Net," the group said.

Eva Galperin, international activist with the San Francisco digital rights organization Electronic Frontier Foundation, said the situation shows what can happen if laws are enacted to "put the power to shut down a portion of the Internet in the hands of a single person, whether it's the president of Egypt or the president of the United States."

Galperin also said that while social networking has given activists in Egypt, Tunisia and Iran a "powerful voice" heard beyond their own borders, the Bay Area is also home to companies that provide computer security tools that governments can use to identify and retaliate against them.

Activists living in countries ruled by authoritarian regimes should take precautions to not reveal personal information that could jeopardize their lives, she said.

Narus singled out

In an article published by the Huffington Post, Timothy Karr, campaign director of the Washington media reform group Free Press, singled out Narus Inc., a Sunnyvale computer security firm, for selling the Egyptian government tools for monitoring Internet and mobile phone traffic.

"What we are seeing in Egypt is a frightening example of how the power of technology can be abused," Karr said.

A spokeswoman for Narus did not return voice and e-mail messages requesting comment.